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    <title>Document</title>
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            <div class="top-1">
                <a href="#">Bootstrap中文网</a>
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            <ul class="top-2">
                <li><a href="#">Bootstrap3中文网</a></li>
                <li><a href="#">Bootstrap4中文网</a></li>
                <li><a href="#">Sass 教程</a></li>
                <li><a href="#">Less 教程</a></li>
                <li><a href="#">jQuery API</a></li>
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                <a href="#">关于</a>
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            <div class="middle-content w">
                <h1>Bootstrap</h1>
                <h2>简洁、直观、强悍的前端开发框架，让wep开发更迅速、简单。</h2>
                <button><a href="#">Bootstrap3中文网(v3.4.1)</a></button>
                <p><a href="#">Bootstrap2中文网(v2.3.2)</a></p>
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